topology A result in topology stating that a continuous vector field on a sphere is always zero somewhere. The name comes from the fact that you can’t flatten all the hair on a hairy ball, like a tennis ball, there will always be a tuft somewhere (where the tangential projection of the hair is zero). […]

noun 1. a form of cancer in which abnormal cells with many hairlike cytoplasmic projections appear in the bone marrow, liver, spleen, and blood. hairy cell leukemia n. A lymphocytic leukemia, usually originating with B cells, and characterized by splenomegaly and cells with a ciliated appearance in the spleen, bone marrow, liver, and blood. Also […]

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